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Construct
the thing that's being measured;
can be abstract
or tangible
Indicator
a construct that gives information about another construct
used when researchers can't get to a construct directly
eg; skin response to indicate nervousness
Operationalization
Indicators that give us access to to some aspect of the real-world manifestation of their respective constructs
Artifacts
Other unwanted factors that impact on a result
Valid
an indicator that is not contaminated by artifact or error
Reliable
an indicator that produces the same result every time
Variable
an operationalization of a construct that
can change
there are no universal variables
can be btwn people or over time
Discrete variables
variables can only take certain values and no others
accurately measurable in principle
eg categorical or numerical
Continuous
variables which theoretically could take any value over their
range
only ever measured aproximately
Nominal measurement
a variable has categories or states that differ in kind but not in any order or degree
Ordinal measurement
a variable has categories or ranks that are ordered but whose differences are not quantifiable
Interval measurement
a variable has values on a scale whose differences are quantifiable but which lacks a true zero point
therefore cannot make comparisons because you need a true zero point
Ratio measurement
A variable has a scale with quantifiable differences and a true zero
is therefore comparable
Author
Domi_Coy
ID
138231
Card Set
Quant Stats
Description
measurement, variables and data
Updated
2012-02-28T01:49:58Z
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